57.7.9.5.5 Header Reception

Each LON frame, after receiving the preamble, receives the frame header also called L2HDR according to CEA-709 specification. This header consists of the priority bit, the alternative path bit, and the backlog increment.

The frame header is the first received data and the RXRDY bit rises as soon as the frame header as been received and stored in the Receive Holding register (FLEX_US_RHR).